Importance

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Abstract

The present invention introduces a method of reducing conductive and convective heat loss from the battery unit in battery-powered devices, such as RFID tag devices. Battery heat loss prevention is accomplished by suspending the battery in a vacuum or within a low thermally conductivity gas, such as air, nitrogen, helium or argon. Further improvement is accomplished by using a minimum number of suspension points made of solid material which possesses a low thermally conductivity. The battery can be suspended by various means, the first of which totally encapsulates the battery using the minimum number of solid material suspension points mentioned above, and the second of which only a portion of the battery (such as the lower portion) is suspended in a low thermally conductive material and the upper portion is encapsulated by the low thermally conductive material fabricated in an arching structure that does not contact the upper portion of the battery. Both approaches allow suspension of the integrated circuit (IC) to be driven by the battery within the same confines of the battery by bonding the IC to the upper surface of the battery with the IC thereby residing underneath either the top solid material structure of the first approach or the arching structure of solid material of the second approach.

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First Claim